25139165 has 4 divisors (see below), whose sum is σ = 30167004. Its totient is φ = 20111328.

The previous prime is 25139159. The next prime is 25139227. The reversal of 25139165 is 56193152.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14341369 + 10797796 = 3787^2 + 3286^2 .

It is a cyclic number.

It is not a de Polignac number, because 25139165 - 2¹⁴ = 25122781 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2513912 + ... + 2513921.

It is an arithmetic number, because the mean of its divisors is an integer number (7541751).

Almost surely, 2^25139165 is an apocalyptic number.

It is an amenable number.

25139165 is a deficient number, since it is larger than the sum of its proper divisors (5027839).

25139165 is an equidigital number, since it uses as much as digits as its factorization.

25139165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5027838.

The product of its digits is 8100, while the sum is 32.

The square root of 25139165 is about 5013.8971868198. The cubic root of 25139165 is about 292.9433314208.

The spelling of 25139165 in words is "twenty-five million, one hundred thirty-nine thousand, one hundred sixty-five".